What is going on with me??

So I'm a little confused and I wondered if anyone had any ideas or had been in this situation.

I went for an early scan on the 11th when I should have been 7weeks but said I measured 6w1d, no heartbeat

I started bleeding on the 16th and having pain so I rang our hospital and went up yesterday, there scan said I measured 5w6d, there was a fetalpole but no heartbeat.

I went for my prebooked appointment at the early pregnancy unit today and they said I measured under 6 weeks but found a heartbeat 💓

I should be 8 weeks by my calculations as I ovulated on the 5th and had a

positive test on the 19th.

Don't know what to think, trying to not get my hopes up